What is the fundamental safety rule when working with electricity?

The fundamental safety rule when working with electricity is to always assume that all wires are energized. This precautionary principle is important because it establishes a mindset that prioritizes safety and prevents complacency. Many electrical hazards can be invisible—such as live wires hidden behind walls or in devices. Approaching electrical work with the assumption that all wires are energized helps ensure that individuals take necessary protective measures, such as wearing appropriate personal protective equipment and using tools designed for electrical work.

This rule is especially vital because overconfidence in one's knowledge or ability to identify whether a wire is live can lead to dangerous situations, including electrocution. By maintaining the mindset that all wires may carry a current, workers are more likely to perform safety checks, use proper lockout/tagout procedures, and keep safety barriers in place.

Understanding this rule helps reinforce the importance of continuous vigilance and respect for electrical hazards, which is crucial in promoting a safe working environment.